return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CI4 (tetraiodomethane)

using model chemistry: B2PLYP=FULL/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes TD 1A1
Energy calculated at B2PLYP=FULL/3-21G*
 hartrees
Energy at 0K-27597.531067
Energy at 298.15K 
HF Energy-27597.315106
Nuclear repulsion energy2774.876552
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at B2PLYP=FULL/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 183 183 0.00 17.86 0.00 0.00
2 E 82 82 0.00 2.76 0.75 0.86
2 E 82 82 0.00 2.76 0.75 0.86
3 T2 591 591 37.71 14.31 0.75 0.86
3 T2 591 591 37.71 14.31 0.75 0.86
3 T2 591 591 37.71 14.31 0.75 0.86
4 T2 121 121 0.05 3.87 0.75 0.86
4 T2 121 121 0.05 3.87 0.75 0.86
4 T2 121 121 0.05 3.87 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 1241.1 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 1241.1 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at B2PLYP=FULL/3-21G*
ABC
0.01019 0.01019 0.01019

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP=FULL/3-21G*

Point Group is Td

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.000
I2 1.276 1.276 1.276
I3 -1.276 -1.276 1.276
I4 -1.276 1.276 -1.276
I5 1.276 -1.276 -1.276

Atom - Atom Distances (Å)
  C1 I2 I3 I4 I5
C12.21082.21082.21082.2108
I22.21083.61023.61023.6102
I32.21083.61023.61023.6102
I42.21083.61023.61023.6102
I52.21083.61023.61023.6102

picture of tetraiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 109.471 I2 C1 I4 109.471
I2 C1 I5 109.471 I3 C1 I4 109.471
I3 C1 I5 109.471 I4 C1 I5 109.471
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability